Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5b6d4d440f455d…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 20:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 432942fa049911f8f8680e7081a3862b SHA-1: 34556d1b0f97c02f5696b0b1b11f9d6f7b28b50e SHA-256: 8d5b6d4d440f455d673d4fa28a55d301292928d2020f0dfe3d1a4f7bc27789a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm. These links likely lead to phishing content or further malware distribution, aligning with a spearphishing attachment attack pattern. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=how+to+mix+bright+red+acrylic+paint PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1d08656d---nijowerenep.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/40d63765724ea33c38e09f1bbdbbabdb/97062973527.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/vt8o6i1apbq4rj23iqt8mejkea/wuxasivobiwubulev.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba409d2d736---49603571243.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962acf010f8---wazogipasibame.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i67qq213j83jm4ojio1h40dpv3/vujeb.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bfe1e7bda693a85f50fbdc50aa94fb05/semupoluwebeluvowirek.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/6127362321.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bd01e4722---xufupuwaxazetuvi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609babfa1505f---79613825545.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0k27fl118ckccmbgd48248crc0/59809736600.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/jexipijus.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d74a32627---kebot.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/39435993371.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/1395794119.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/sagibonukotal.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3577b308d---47981863157.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gibeja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbce779f8---belem.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/jebifenodik.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb867bb3232---xinurefibi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf70b39935---57777562997.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074a06ca1c6a---98534210348.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/559579711.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dg39qbdt3v4thc0krnhm0gbe13/retelobedudo.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/gofatikijumuripewa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 11224 bytes
SHA-256: f50410af8385c36a903dc280399e8699809c4e5a748f1ab61f01d9a42b0a499b
font_02_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 16564 bytes
SHA-256: 9b12847a5ff5b3b3548f9d857f64afebaf6b80096400c36cb11a8a9afd2a5cb4

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